【摘要】 采用脉冲微波强化丝光等离子体反应装置 ,研究了甲烷氧化偶联与二氧化碳重整制合成气 (CO +H2 )副产乙炔、乙烯的反应 .常压下 ,当CH4和CO2 流量分别为 12 0 ,80mL/min ,微波峰值功率 12 0W ,脉冲通断比为 10 0 / 10 0ms时 ,CH4和CO2 转化率分别为 70 .8% ,6 8.8% ;CO ,C2 H2 ,C2 H4选择性分别为 75 % ,17.8%和 4 .1% ,产物中没有积炭 .H2 /CO摩尔比值随原料气中甲烷比例的增加而增大 ,当CH4/CO2 摩尔比为 2∶1时 ,H2 /CO摩尔比达到 2 ,这种比例的合成气能方便地用于下一步的Fischer Tropsch反应和其他化学品的合成 .与其他等离子体反应相比 ,采用脉冲强化常规丝光等离子体进行CH4脱氢偶联与CO2 重整反应 ,能量效率明显提高 ,这对于促进微波等离子体技术在C1化学中的应用具有重要的意义 .更多还原

【Abstract】 A conventional wire like plasma enhanced and spread by pulsed microwave was used to study the oxidative coupling and reforming of CH 4 with CO 2 to CO, C 2H 2, C 2H 4 and H 2. Under the conditions of atmospheric pressure, flow rate of 200 mL/min (CH 4/CO 2=1.5∶1), peak microwave power of 120 W and pulse duty factor of 100/100 ms, conversions of CH 4 and CO 2 were 70.8% and 68.8%, respectively; selectivities of CO, C 2H 2, C 2H 4 were 75%, 17.8% and 4.1%, respectively, and there was no carbon deposits. Ratio of H 2/CO increased with increasing CH 4 concentration in the feed gas, and a H 2/CO ratio of 2 could be obtained at a ratio 2∶1 of CH 4 to CO 2, which is acceptable for Fischer Tropsch and other synthesis processes. The energy efficiency of the pulsed microwave plasma was obviously improved. We suggested that this enhanced pulsed plasma is useful for oxidative coupling and reforming of CH 4 with CO 2 in C1 chemistry.更多还原